Improvement in saw-mill dogs



G. W. RODEBAUGH.

Mill Do Saw- N0. 211.790; v Patented Jan. 28,1879.

UNITED anion;

GEORGE W. RODEBAUGH, OF DETROIT, MICHIGAN.

IMPROVEMENT IN SAW-MILL DOGS.

Specification forming part of Letters Patent N0. 211,790, dated January28, 1879 application filed October 28, 1878.

To all whom it may concern..-

Be it known that I, GEORGE W. Ronn- BAUGH, of Detroit, in the county ofWayne and State of Michigan, have invented an Improvement in Saw-MillDogs, of which the following is a specification:

The nature of my invention relates to certain new and usefulimprovements in sawmill dogs, the more especially adapted tocircular-saw mills, and the improvements are designed as such upon adevice patented to me October 16, 1877, No. 196,102.

The invention consists, first, in the combination of devices foroperating a lower dog beneath the log on the carriage; secondly, in thedevices for controlling the action, as clesired, of dogs laterally; and,lastly, in certain details of construction and combinations of parts, asmore fully hereinafter described.

Figure 1 represents an end elevation of the invention, showing theeccentric-lever raised and the bit of the dog retracted from the log,and also, in dotted lines, the position of the parts when the bit of thedog is embedded in the log and the device locked. This view also showsthe face of the knee brokenaway to disclose the laterally-working dogsand their connections. Fig. 2 is a perspective view taken from the sideopposite to that shown in Fig. 1. Fig. 3 is a detached section, showinganenlarged view of the laterally-working dogs when retracted, and indotted lines when protruded, and also showin g the devices by means ofwhich said dogs are brought into action, or remain inert while thevertically-working dogs are being operated.

In the accompanying drawings, which form a part of this specification, Arepresents a standard rising from the head-block proper, and serves as aguide for the dog head or stock B. O is a vertical, flat, and perforatedbar, which passes through a correspondinglyshaped slot inthe dog-head.This bar also passes through a similar slot in the overhanging head a ofthe standard A, above which said bar is provided with a return-bend, b,at the termination of which it is pivotally secured to theconnecting-rodD, the opposite end of which is pivotally secured to thecenter of the eccentric E. The eccentric is pivoted at c to the rearside of the guide-standard A by a bolt, which also passes throughacurved slot (not shown) in the end of the connecting-rod, which ishidden behind the eccentric, which latter is so arranged that when itsarm E is raised to nearly a vertical position, as shown in Fig. 1, itwill elevate the perforated bar carrying the dog-head, and hold the bitof the dog out of contact with the log, while a downward movement of thearm will force the bit into the log until the eccentric reaches thelimit of its throw and is on its center, in which position the dog willbe firmly looked, as shown in dotted lines, Fig. 1.

To vertically adjust the dog-head and se* cure it in position on itscarrying-bar, to suit difl'ering sizes of logs on the carriage, I employthe following devices: A rigid thumbpiece, d, projecting laterally fromthe outer face of the dog-head B, a bell-crank, e, pivoted immediatelybelow the thumb-piece, and to the lower arm, a, of this bell-crank ispivoted the pin f, which, passing through a corresponding hole in thefront of the head-block, engages with any one of the perforations in thevertical bar 0. v

By the construction and arrangement of de vices a better and lessexpensive method of adjustably securing the doghead is obtained than themethod described and shown in said Letter Patent, and a reference tosaid Letters Patent will fully describe the construction of theclog-head B, its laterally-sliding dog, and the devices which secure itin place and allow it to be protruded and retracted at pleasure.

Near the bottom of the standard A is pivoted a curved dog, F, its innerend being provided with an outwardly-projecting pin, g, which engageswith the slot h in the heel of the perforated bar 0 in such .manner thatwhen the eccentric is operated to throw the upper dog-bit, protrudingfrom the dog-head, into the log, the downward movement of the bar 0 willforce this lower dog, F, to enter the log from below, thereby doggingsaid log above and below, and rendering it impossible for the log toturn on the carriage. A reverse of the motion just described withdrawsboth the upper and lower dogs from the log simultaneously.

G is an arm pivotally secured to the 600611 trio at z, and also pivotednear its opposite end to the upper end of the strap 70, and outside thislatter pivotal point an inwardly-projecting pin, 0, from the arm Gtraverses the segmental slot 1' in the strap 70. The lower end of thisstrap is pivoted at s to the strap a, each end of which is in turnpivoted to the outer ends of the two curved dogs 10 20. -All these partsare so arranged that when the arm G and straps k and a are in verticalline, as shown in Figs. 1 and 3, the motion described to actuate theupper and lower dogs will project the laterally-working dogs 10 10,which are pivoted to the guide-standard,into the sideof the cant, andwithdraw them. If for any cause it is not desired to use them at times,the lower end of the arm G is pushed backward, which, by means of thepin 0 and segmental slot 1", carries backward the upper end of the'strap70 into the position shown in dotted lines in Fig. 3, whenthe upper andlower dogs may be actuated, as hereinbefore described, and the lateraldogs 20 w will remain inert.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In combination, the standard A, with eccentric E pivoted thereto, andconnecting-rod D, and perforated carrying-bar G, the lower dog, F,actuated by the pin 1 and slot h, sub stantially as and for the purposesspecified.

2. The combination, with the verticallymoving bar 0, connected at itsupper end with the eccentric E, of the dog-head B, carried by such bar,and provided with a laterally-ad justable dog, and the pivoted dog I,having pin g, and operated by the slot h at the lower end of the bar 0,substantially as described and shown.

3. The combination, with the standard A, of the laterally-working dogs20 w, pivoted to the standard and connected with the cocentric E,pivoted to such standard above the said dogs, and the verticalcarrying-bar 0,

operating the vertically-working dogs, and

bent at its upper end, I), and connected to the eccentric by the rod D,substantially as described and shown.

4. In combination, the standard A, the eccentric E, pivoted thereto, thearm G, pivoted to said eccentric, the strap k, pivoted to said arm andprovided with a segmental slot, 1', the strap a, pivoted to said strapk, and the laterally-working dogs w w, pivoted to said strap a,constructed and arranged and operating substantially as and for thepurposes specified.

GEORGE W. RODEBAUGH.

Witnesses:

H. S. SPRAGUE, GHAs. J. HUNT.

